chore: remove stale ts-node config remnants

[chenjiahan]

Summary

• remove the obsolete ts-node-register CLI config fixture and its builtin loader semantics test now that TypeScript configs are loaded via jiti
• drop leftover ts-node sections from repository tsconfig files that are no longer used after the loader migration

Related links

• feat(cli): use jiti to load typescript config #13690

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[Copilot]

Pull request overview

This PR removes leftover ts-node-based config fixtures and ts-node-specific tsconfig settings, aligning the repo with the current TypeScript config loading approach (via jiti) and reducing stale maintenance surface.

Changes:

• Removed the ts-node-register CLI config fixture and its associated “builtin loader semantics” test.
• Dropped obsolete "ts-node" sections from various tsconfig.json files used in tests/benchmarks and packages/rspack.
• Kept existing jiti loader coverage in config.test.ts as the remaining validation path.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/e2e/tsconfig.json	Removes unused ts-node config block from e2e tsconfig.
tests/bench/fixtures/ts-react/tsconfig.json	Removes unused ts-node compilerOptions override from benchmark fixture.
packages/rspack/tsconfig.browser.json	Removes unused ts-node config from browser tsconfig.
packages/rspack-cli/tests/build/config/ts-node-register/tsconfig.json	Deletes obsolete fixture tsconfig.
packages/rspack-cli/tests/build/config/ts-node-register/rspack.config.ts	Deletes obsolete fixture rspack config.
packages/rspack-cli/tests/build/config/ts-node-register/main.ts	Deletes obsolete fixture entry file.
packages/rspack-cli/tests/build/config/config.test.ts	Removes the test suite that depended on the deleted fixture and old loader semantics.

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[github-actions]

Rsdoctor Bundle Diff Analysis

Found 6 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Change
popular-libs	1.7 MB	0
react-10k	5.7 MB	0
react-5k	2.7 MB	0
rome	984.1 KB	0
react-1k	826.2 KB	0
ui-components	5.0 MB	0

Generated by Rsdoctor GitHub Action

[github-actions]

📦 Binary Size-limit

Comparing 5115797 to feat(cli): use jiti to load typescript config (#13690) by hardfist

🎉 Size decreased by 5.34KB from 49.39MB to 49.38MB (⬇️0.01%)

[codspeed-hq]

Merging this PR will improve performance by 4.63%

⚡ 2 improved benchmarks
✅ 26 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	rust@concatenate_module_code_generation	142.1 ms	135.8 ms	+4.63%
⚡	Simulation	rust@create_chunk_ids	10.6 ms	10.3 ms	+2.89%

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_{Comparing chenjiahan/chore-remove-ts-node-remnants (5115797) with main (af4e32e)}